@hackage fec0.2.0

This code, based on zfec by Zooko, based on code by Luigi Rizzo implements an erasure code, or forward error correction code. The most widely known example of an erasure code is the RAID-5 algorithm which makes it so that in the event of the loss of any one hard drive, the stored data can be completely recovered. The algorithm in the zfec package has a similar effect, but instead of recovering from the loss of only a single element, it can be parameterized to choose in advance the number of elements whose loss it can tolerate.